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The origin of the internal nostril

By Ricardo Hughes,2014-11-25 11:24
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The origin of the internal nostril

The origin of the internal nostril of tetrapods

    Min Zhu* & Per E. Ahlberg

    *Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, P. O. Box 643, Beijing 100044, China

    Department of Evolutionary Organismal Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden

    Supplementary Methods

I, Phylogenetic analysis. We performed the analysis using the software package PAUP3.1

    with the data matrix of ref. 11 which scored 29 taxa for 99 morphological

    characters. Based on additional materials or new examination, Kenichthys was complemented

    with 31 additional morphological characters coded (in bold below). Character 39 is re-coded for 9 genera. We used the same algorithms as in ref. 11, i.e. most parsimonious trees were

    identified using the heuristic search algorithm, stepwise addition, with 500 random iterations. All characters were weighted equally. Characters 15, 20, 25, 32 and 80 were ordered, and all other characters were unordered. Note that Characters 23 and 70 (ordered in ref. 11, of two-state in the data matrix) were unordered. The analysis yielded 18 most parsimonious trees showing the same major groupings (except the resolution of three megalichthyids) as ref. 11. For the purpose of the comparison, we also performed the analysis with all characters unordered, that yielded 12 most parsimonious trees. Two consensus trees only differed in the resolution of Youngolepis as the sister group of Diabolepis + Dipterus. Kenichthys always

    appeared as the most basal tetrapodomorph.

II, Character list of ref. 11 with new codings for Kenichthys in bold. Characters 7 and 98

    are redefined (in italics).

    1 Parasymphysial plate: 0 - long, sutured to coronoid, denticulated or with tooth row; 1 - short, not sutured to coronid, denticulated; 2 - carrying tooth whorl (unordered). 2 Splenial: 0 - not sutured to prearticular; 1 - sutured to prearticular.

    3 Anterior end of prearticular: 0 - not forked; 1 - forked.

    4 Prearticular and angular: 0 - separated by ventral exposure of Meckelian bone; 1 - in contact.

    5 Prearticular: 0 - rear part with conspicuous horizontal ledge; 1 - rear part flat. 6 Retroarticular process: 0 - absent; 1 - present.

    7 Parasymphysial plate: detachable whorl (0); sutured plate with denticles or teeth (1).

    8 Coronoid proportions: 0 - posterior coronoid same length as middle coronoid, or shorter; 1 - posterior coronoid significantly longer than middle coronoid. 9 Marginal denticle band on coronoids: 0 - narrower than fang-bearing lamina; 1 - broader than fang-bearing area, at least posteriorly.

    10 Length of dentary; 0 - long; 1 - short with lip fold.

    11 Dentary tooth row reaches symphysis: 0 - yes; 1 - no.

    12 Dentary fang pair: 0 - absent; 1 - present.

    13 Number of fang pairs on posteriormost coronoid: 0 - one; 1 - two; 2 - none (unordered).

14 Tooth folding: 0 - none; 1 - generalized polyplocodont; 2 - labyrinthodont; 3 -

    dendrodont (unordered).

    15 Infradentary foramina: 0 - always present; 1 - variable; 2 - always absent (ordered). 16 Dentition of palatoquadrate complex; 0 - marginal teeth; 1 - tooth plates. 17 Number of fang pairs on ectopterygoid: 0 - one; 1 - two; 2 - none (unordered).

    18 Proportions of entopterygoid: 0 - anterior end level with processus ascendens; 1 - anterior end considerably anterior to processus ascendens.

    19 Entopterygoids meeting in midline: 0 - no; 1 - yes.

    20 Posterior process of vomers: 0 - absent; 1 - short; 2 - long (ordered).

    21 Anteromedial process of vomer: 0 - absent, vomers separated; 1 - present; 2 - absent, vomers in close contact (unordered).

    22 Vomer proportions: 0 - not much broader than long; 1 - much broader than long.

    23 Relationship of vomer to parasphenoid: 0 - no contact, or simple abutment; 1 -

    overlap.

    24 Vomerine fangs: 0 - absent; 1 - present.

    25 Internasal pits: 0 - undifferentiated; 1 - strong midline ridge but shallow pits; 2 - deep

    pear-shaped pits (ordered).

    26 Posterior end of parasphenoid: 0 - denticulated field extends into spiracular groove; 1 -

    denticulated field does not extend into spiracular groove.

    27 Enlarged anterior tooth on premaxilla: 0 - absent; 1 - present.

    28 Choana: 0 - absent; 1 - present.

    29 External nostrils: 0 - two pairs; 1 - one pair.

    30 Position of anterior external nostril: 0 - facial; 1 - edge of mouth. 31 Orientation of anterior tectal and lateral rostral relative to external nostril: 0 -

    dorsal/ventral; 1 -posterior/anterior.

    32 Width of ethmoid relative to length from snout tip to posterior margin of parietals: 0 - more than 80%; 1 - 70-80%; 20 - 50-70%; 2 - less than 40% (ordered).

    33 Extent of crista parotica: 0 - does not reach posterior margin of tabular; 1 - reaches posterior margin of tabular.

    34 Cosmine: 0 - present; 1 - absent.

    35 Westoll lines: 0 - absent; 1 - present.

    36 Pineal foramen: 0 - present; 1 - absent.

    37 Location of pineal foramen/eminence: 0 - level with posterior margin of orbits; 1 - well posterior to orbits.

    38 Parietals surround pineal foramen/eminence: 0 - yes; 1 - no.

    39 Shape of pineal series: 0 - round or oval; 1 - kite-shaped with distinct posterior corner. (non-applicable for Kenichthys)

    40 Proportions of postparietal shield: 0 - not extremely wide posteriorly; 1 - extremely wide posteriorly.

    41 Postparietals narrow to a point posteriorly: 0 - no; 1 - yes.

    42 Posterior margin of tabulars: 0 - anterior to posterior margin of postparietals; 1 - level with posterior margin of postparietals.

    43 Median postrostral: 0 - absent (postrostral mosaic); 1 - present; 2 - absent (nasals meet in midline) (unordered).

    44 Number of nasals: 0 - many; 1 - one or two.

    45 Frontals: 0 - absent; 1 - present.

    46 B-bone: 0 - absent; 1 - present.

    47 Extratemporal: 0 - present; 1 - absent.

    48 Contact between extratemporal and supratemporal: 0 - absent; 1 - present. 49 Supratemporal series: 0 - complete; 1 - tabular only.

50 Postspiracular: 0 - absent; 1 - present.

    51 Posterodorsal process of maxilla: 0 - present; 1 - very weak or absent. 52 Jugal-quadratojugal contact: 0 absent; 1 - present.

    53 Relationship of jugal to orbit: 0 - contributes to orbital margin; 1 - excluded from

    orbital margin.

    54 Postorbital bone: 0 - contributes to orbital margin; 1 - excluded from orbital margin.

    55 Contact between posterior supraorbital and intertemporal: 0 - present; 1 - absent. 56 Contact between posterior supraorbital and lacrimal: 0 - absent; 1 - present.

    57 Contact between parietal and supraorbital: 0 - present; 1 - absent. 58 Shape of posterior supraorbital: 0 - posterior process shorter than orbital margin; 1 - posterior process much longer than orbital margin.

    59 Position of orbits: 0 - lateral and widely separated; 1 - dorsal and close together. 60 Preoperculosubmandibular: 0 - absent; 1 - present.

    61 Subsquamosals: 0 - absent; 1 - present.

    62 Quadratojugal, squamosal and preopercular fused: 0 - no; 1 - yes. 63 Foramina (similar to infradentary foramina) on cheekplate: 0 - absent; 1 - present. 64 Extrascapular bone overlaps: 0 - median overlaps laterals; 1 - laterals overlap median.

    65 Anterior margin of median extrascapular: 0 - long; 1 - very short.

    66 Postotic sensory canal: 0 - runs through skull roof; 1 - follows edge of skull roof. 67 Postorbital junction of supraorbital and infraorbital canals: 0 - absent; 1 - present. 68 Premaxilla canal-bearing: 0 - yes; 1 - no.

    69 Infraorbital canal follows premaxillary suture: 0 - no; 1 - yes. 70 Groups of small pores on skull roof: 0 - absent; 1 - rare. 71 Dermal intracranial joint: 0 - absent; 1 - present.

    72 Endoskeletal intracranial joint: 0 - absent; 1 - present.

    73 Endoskeletal joint line slopes anteroventrally: 0 - no; 1 - yes.

    74 Position of endoskeletal joint: 0 - runs through profundus foramen; 1 - runs through trigeminus foramen.

    75 Postorbital pillar 0 - absent; 1 - present.

    76 Basicranial fenestra: 0 - absent; 1 - present.

    77 Notochordal pit on sphenoid: 0 - absent; 1 - present.

    78 Processus descendens of sphenoid: 0 - absent; 1 - present.

    79 Pituitary vein exit: 0 -anterior; 1 - dorsal.

    80 Posterior carotid opening in parasphenoid: 0 - large; 1 - small; 2 - absent (ordered).

    81 Profundus foramen in postnasal wall: 0 - small; 1 large.

    82 Rostral tubuli: 0 - absent; 1 - present.

    83 Tectum orbitale: 0 -narrow; 1 - extensive.

    84 Contact margin for clavicle on cleithrum: 0 - straight or faintly convex; 1 - strongly

    concave.

    85 Anocleithrum: 0 - exposed; 1 - subdermal.

    86 Archipterygial pectoral fin: 0 - no; 1 - yes.

    87 Shoulder joint polarity: 0 - caput humeri convex; 1 - caput humeri concave. 88 Caput humeri: 0 - almost flat; 1 - ball-shaped.

    89 Body of humerus: 0 - cylindrical; 1 - flattened rectangular. 90 Deltoid and supinator process on humerus: 0 - present; 1 - absent. 91 Radials: 0 - jointed; 1 - unjointed.

    92 Basal segments of lepidotrichia elongated; 0 - no; 1 - yes. 93 Dorsal and anal fins: 0 - present; 1 - absent.

    94 Posterior radials in posterior dorsal fin: 0 - not branched; 1 - branched. 95 Caudal fin: 0 - heterocercal; 1 - diphycercal.

    96 Epichordal radials in caudal fin: 0 - absent; 1 - present. 97 Basal scutes: 0 - absent; 1 - present. 98 Scale morphology: 0 - rhomboid with internal ridge; 1 -round.

    99 Supraneural spines: 0 - present; 1 - absent.

    III, Data matrix of ref. 11 with new codings for Kenichthys and Character 39 in bold and underlined. Characters 7 and 98 are redefined.

     1 11111 11112 22222 22223 33333 33334 44444 CHARACTER: 12345 67890 12345 67890 12345 67890 12345 67890 12345

    Porolepis 20001 00000 10032 00000 00012 00000 ?0100 10101 01000 Powichthys 20000 00010 10011 0?0?? ??0?2 00000 ?0?00 01100 01000 Youngolepis 20001 00010 10010 00?00 00011 00000 ?0100 101?0 01?0? Diabolepis ????? ????1 00??2 1??00 01000 00001 ?0?01 101?0 00?00 Dipterus ?0?0? ????1 ?0??2 1?110 200?0 ??001 ???01 1?1?0 01000 Cabonnichthys ?100? ??100 01112 01?02 20110 11110 02?1? 01010 01100 Mandageria ?10?? ???00 01?12 01?02 20110 11110 0311? 01010 01100 Eusthenodon 010?0 01100 01112 0??02 2011? ?1110 03?1? 01010 01100 Eusthenopteron ?1000 01100 00112 01102 20110 10110 0311? 00000 01100 Plat'ichthys 01001 01100 01012 0??02 20110 10110 02?1? ??000 01100 Jarvikina ?10?1 0?100 00?12 0??02 20110 10110 0211? 01000 01100 Tristichopterus ????? 0???0 00??2 0??0? ???1? ?0?10 ?2?1? 000?0 010?0 Koharalepis ????? ????0 ???12 0?10? ???1? ???10 ?1?00 010?1 01?00 Canowindra ????? ????0 ????? ????? ????? ???10 ?0?1? 010?1 01?00 Beelarongia ????? ????0 ????? ????? ????? ???10 ?0?00 000?1 001?0 Gyroptychius 1???0 0?000 0?012 0??00 10010 10110 00000 00000 01100 Medoevia 11000 01000 00012 00000 10010 10110 ?0000 00000 01??? Gogonasus 10?00 01000 00011 00000 20010 10110 01000 000?0 00100

    Osteolepis ????? ????0 00?12 0??0? ????? 10?10 01000 00000 00100

    Megalichthys 0100? 11000 01012 00000 11010 11110 10?00 1???0 00100

    Ectosteorhachis 110?? ?1010 010?2 0??00 11010 11110 10000 1???0 0?100

    Cladarosymblema 11000 11000 01012 0??00 11010 11110 10000 10??0 00100

    Barameda ????? ????0 01??2 0??00 ?001? ?1110 00?1? 00000 10010 Gooloogongia 1???? ?1?00 01??2 0???? ????? ?0110 00?1? 01000 10010 Panderichthys 01111 01100 01022 00?01 20110 10110 0301? 010?0 01001

    Acanthostega 11011 01