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Calaichthys tehul
Discussion
Paratypes: IANIGLA-Pv 320 ab, an incomplete specimen which preserves the skull and the anteriormost portion of the body but lacks the caudal fin. This specimen is dorsoventrally preserved as part and counterpart; IANIGLA- Pv 322, an incomplete specimen which has the caudal, dorsal and anal fins but lacks the skull and anteriormost portion of the body. This specimen is laterally preserved.
Taxonomy
Calaichthys tehul was named by Gouiric-Cavalli et al. (2017). Its type specimen is IANIGLA-Pv 321 a–b, an other (An incomplete specimen that has its skull and the anteriormost portion of the body but lacks the caudal fin. The specimen is laterally preserved as a part and c), and it is an impression. It is the type species of Calaichthys.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Calaichthys tehul Gouiric-Cavalli et al. p. 8 fig. 6–15 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Calaichthys tehul Gouiric-Cavalli et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. Gouiric-Cavalli et al. 2017 | Calaichthys is characterized by a combination of characters, including unique features among redfieldiiforms which are marked with [*].Small-sized and fusiformn actinopterygians (>50 mm of TL). Bullet-shaped head with a length of c. 10 mm. Large orbit (c. 30% of the total skull length) anteriorly placed. Extremely short preorbital region; postorbital region reaching more than 50% of the total length of the skull. Thin and mainly unornamented dermal skull roof bones. Unornamented rostral bone [*]. Two extrascapulars delicately ornamented with very small tubercles and having a bifid posterior margin [*]. Triangular dermosphenotic ornamented with very small tubercles and few rugae [*]. Two wide and quadrangular postparietals of about half the length of the parietals. Three suborbital bones [*]. An anteriorly inclined (in an angle of c. 40°) and hatchetshaped preopercle, which broadly extends over the posterior margin of the maxilla. Rectangular and slender opercle which is much smaller than the subopercle [*]. Deep mouth gape. Unornamented maxilla with a well-developed postorbital plate and an extremely short posteroventral process. Dentary is ornamented with rugae anteriorly [*]. A median gular plate. Conic and slightly backward inclined dentary teeth. Entopterygoid, ectopterygoid and dermopalatine with small pointed teeth disposed in several series. Pectoral fins composed of numerous principal fin rays (17–18) which are stout, stiff, non-segmented, and branched twice distally [*]. Short and tall dorsal fin with thin and barely segmented fin rays [*]. Dorsal and anal fins opposite in origin and located in a posterior position near the origin of the caudal fin. Pelvic fins located midway between pectoral and anal fins and composed of 11–12 segmented fin rays [*]. Falcate anal fin with a long base and highly segmented fin rays. Two rows of bifid scales between the posttemporal and the dorsal fin [*]. Two big and almost circular scutes preceding the dorsal fin base [*]. Well-developed fringing fulcra present in paired and unpaired fins. Robust and long fringing fulcra associated with the pectoral and pelvic fins. Caudal peduncle flanked by well-developed and robust basal fulcra.Thin ganoid scales all over the body. Flank scales with a serrated posterior margin and ornamented with two or three parallel ridges [*]. Serration in flank scales varies between two well-developed serrations and more than three less developed ones; caudal peduncle scales without serration [*]. Rhombic dorsal body scales with three serrations in their posterior margin (two well-developed and a tiny one) [*]. Rectangular ventral body scales with three poorly developed serrations [*]. Ventral body scale rows with highly imbricated scales. More or less rectangular lateral line scales with the lateral line pore between two serrations [*]. Rhombic or lanceolate caudal peduncle scales which lack ornamentation [*]. A series of rectangular plate-like structures or scutes between both pectoral fins [*]. Hemiheterocercal caudal fin with an abbreviated but conspicuous scaly lobe that extends halfway along the dorsal lobe. Very well-developed dorsal and ventral scutes and basal fulcra preceding the caudal fin. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||