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Fig. 10 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 10. Onithochiton maklayi, holotype (ZISP 2305), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 36.0 mm. A – valve IV, surface of tegmentum in central and lateral areas; B – dorsal spicules and needles; C – dorsal spicules and needles, marginal needles and ventral scales; D – dorsal spicules.

Fig. 8 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 8. Lucilina nemirkoae, holotype (ZISP 2304), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m. BL 7.0 mm. A – dorsal spicules and needles; B, D – ventral scales; C – dorsal spicules, needles and marginal needles.

Fig. 9 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 9. Onithochiton maklayi, holotype (ZISP 2305), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 36.0 mm. A – head valve, dorsal view; B – valve II, dorsal view; C – valve V, dorsal view; D – tail valve, dorsal view; E – tail valve, lateral view; F – valve IV, surface of tegmentum in central and lateral areas; G – valve VII, ventral view; H – valve VIII, ventral view; I – valve IV, rostral view.

Fig. 5 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 5. Lucilina insueta, holotype (ZISP 2303), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 20 mm. A, C – ventral scales; B – radula; D – head of major lateral tooth of radula.

Fig. 2 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 2. Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm. A – dorsal scales; B – ventral spicules near margin; C – ventral spicules, in middle; D – heads of major lateral teeth.

Fig. 1 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 1. Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm. A – head valve, dorsal view; B – valve V, dorsal view; C – tail valve, dorsal view; D – valve IV, ventral view; E – surface of tegmentum in central and lateral areas; F – tail valve, lateral view; G – valve V, rostral view.

Fig. 4 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 4. Lucilina insueta, holotype (ZISP 2303), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 20 mm. A – valve IV, lateral view; B – tail valve, ventral view. Arrows show slits of insertion plates; C – dorsal and ventral scales; D – dorsal scals.

Fig. 7 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 7. Lucilina nemirkoae, holotype (ZISP 2304), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m. BL 7.0 mm. A – valve IV, ventral view, insertion plate without pectination; B – tail valve, ventral view; C – valve IV, lateral view, insertion plate and apophyses without pectination; D – head of major lateral tooth of radula.

Fig. 12 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 12. Color images of species of genera Onithochiton, Rhyssoplax and Lucilina. A – Onithochiton maklayi, holotype (ZISP 2305), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 36.0 mm; B – Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm; C – Lucilina insueta, holotype (ZISP 2303), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 20 mm.

Fig. 3 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 3. Lucilina insueta, holotype (ZISP 2303), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 20 mm. A – head valve, dorsal view; B – valve V, dorsal view; C – tail valve, dorsal view; D – valve IV, ventral view; E – surface of tegmentum in central and lateral areas; F – tail valve, lateral view; G – valve V, rostral view.

Fig. 6 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 6. Lucilina nemirkoae, holotype (ZISP 2304), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m. BL 7.0 mm. A – head valve, dorsal view; B – valve II, dorsal view; C – valve V, dorsal view; D – tail valve, dorsal view; E – valve IV, ventral view; F – surface of tegmentum in central and lateral areas; G – tail valve, lateral view; H – valve V, rostral view.

Fig. 11 in New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea

Fig. 11. Onithochiton maklayi, holotype (ZISP 2305), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 36.0 mm. A – valve VIII, sculpture of insertion plates; B – radula; C – central and first lateral teeth of radula; D – head of major lateral teeth of radula.

FIGURE 6 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 6 | Tlaloc candalarius. A. Male (MZ-UNICACH 7567, 71.4 mm SL); B. Female (MZ-UNICACH 7567, 78.8 mm SL); note the orange coloration of the dorsal and anal fins in the male.

FIGURE 8 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 8 | Geographical distribution of species of the genera Tlaloc and Profundulus in southern Mexico and Central America.

FIGURE 7 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 7 | Bony spinules in fin rays of male Tlaloc labialis, indicated by arrow (MZ-UNICACH 6740, 75.7 mm SL), articulated with the lateral surfaces of the anal fin rays.

FIGURE 3 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 3 | Lateral view of left jaws, suspensorium and opercular series in specimens cleared and stained. A. Tlaloc portillorum (MZ-UNICACH 7222, 70.5 mm SL); B. Profundulus mixtlanensis (MZ-UNICACH 6716, 55.6 mm SL). Arrow points to dorsal margin of the interoperculum, with a long or short extension. Abbreviations: de, dentary; pm, premaxilla; ra, retroarticular; mx, maxilla; pl, palatine; qu, quadrate; ar, articular; ms, mesopterygoid; io, interopercle; sy, sympletic; hy, hyomandibula; po, preopercle; op, opercle; so, subopercle.

FIGURE 4 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 4 | Ventral view of left lacrimal. A. Tlaloc portillorum (MZ-UNICACH 7222, 70.5 mm SL); B. T. hildebrandi (MZ-UNICACH 2266, 75.1 mm SL); C. Profundulus mixtlanensis (MZ-UNICACH 6716, 55.6 mm SL); and D. P. punctatus (MZ-UNICACH 6632, 67.3 mm SL). Arrow point to ventral margin of the lacrimal.

FIGURE 5 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 5 | Male general morphology and caudal fin squamation, life colour patterns in: A. Tlaloc labialis; and B. Profundulus punctatus. Solid arrow points to the squamation of the caudal fin, dashed arrow points to the humeral spot.

FIGURE 1 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 1 | Morphometric characters, based on sketches of Profundulus in lateral view. Morphometric measurements in the Material and Methods section.

FIGURE 2 in Redescription and diagnoses of the genera Profundulus and Tlaloc (Cyprinodontiformes: Profundulidae), Mesoamerican endemic fishes

FIGURE 2 | Ventral view of the neurocranium, in specimens cleared and stained. A. Tlaloc portillorum (MZ-UNICACH 7222, 70.5 mm SL); B. Vomer region of T. candalarius (MZ-UNICACH 3899, 61.7 mm SL); C. Vomer region of Profundulus kreiseri (MZ-UNICACH 7214, 59.6 mm SL); and D. Neurocranium of P. mixtlanensis (MZ-UNICACH 6716, 55.6 mm SL). Abbreviations: V, vomer (Y-shaped); E, lateral ethmoid; M, mesethmoid; P, parasphenoid; AF, autopterotic fossa.