Key to the genera of the Trichonotidae found in New Zealand:—
Origin of dorsal behind that of anal.
Eyes normal; interorbital of moderate width; no spine on end of maxillary.
Operculum and interoperculum scaleless, but with well-developed striae. Preoperculum denticulated. A flattened spine crossing the operculum.
Lateral line very low on body.
Whole of rays of dorsal and anal simple, articulated.
Tewara n. g.
Origin of dorsal in advance of the anal.
(1) Eyes large; interorbital very narrow; a spine on end of maxillary.
Operculum and interoperculum covered with scales; preoperculum not denticulated; no spine crossing the operculum.
Lateral line in middle of the height of body.
Dorsal rays simple articulated, anal rays branched.
Tewara cranwelli n.g. et sp. (Plate 25). D. XXXV; A. XLII; P. XV; C. XIII 1/1; V. i/V.
Depth 8.14, head 5.7 in the length to end of caudal peduncle. Eye 10 in head.
Head depressed anteriorly, broadest over operculum, covered with moderate cycloid scales excepting the top of snout, operculum, and interoperculum, the two latter bearing well-defined striae. Margin of preoperculum finely denticulated. Operculum with a flattened adherent spine crossing its upper half. Eye moderate, high in
head, cutting the profile. Interorbital space half diameter of eye, with a slight ridge mesially. Nostrils nearer tip of snout than eye, with a very low tube.
Mouth oblique, reaching backward beyond the posterior border of the eye, upper jaw slightly the longer, lower jaw extremely thin and weak.
Maxilla reaching somewhat beyond the posterior margin of eye, very thin and scaleless.
Minute, slightly hooked villiform teeth present in both jaws in a single series, and a small cluster still more minute on the vomer. Tongue free, elongate, pointed.
Gills four; gill-rakers nine approximately on lower half of the anterior limb.
Body sub-cylindrical, elongate, becoming compressed towards the caudal, the dorsal and ventral surfaces subequal, gradually tapering towards the peduncle, covered with small cycloid scales which extend forward to the interorbital. Lateral line, commencing at upper angle of operculum, descends abruptly behind the pectoral, and thence follows an almost straight course to end of peduncle; it is situated very low on the body, about quarter the distance from the anal base, well defined as a continuous series of small triangular spines directed forward.
Dorsal fin with its origin at the vertical from the third anal ray, composed entirely of simple articulated rays. Anal in every way similar to the dorsal, but the rays are somewhat shorter and greater in number. Caudal and pectoral similar in form to the dorsal and anal.
Colour.—Body pale golden brown, with a continuous series of dark brown blotches extending along top of back as far as end of peduncle. A smaller and more crowded series of blotches extends from top of operculum all along the middle line of body, and there are two conspicuous dark brown bands, narrowly joined in the centre, at the base of caudal.
The lateral line is slightly lighter than the body colour. Head with a dark mottled patch on the nape, and mottled brownish before the eyes and on snout. A blackish margin at the apex of both jaws. Operculum pale bluish and transparent. Eye mottled, the pupil blue-black. All fins immaculate.
Described and figured from a specimen which is 57 mm. long from tip of snout to end of caudal peduncle. Height of body 7 mm.; length of head 10 mm.
Since describing this specimen I have obtained another from Parengarenga, captured by the Museum collecting party while dredging at the entrance to Parengarenga Harbour on sandy bottom, February, 1932, and a third specimen was dredged about 1000 yards off Mount Maunganui, Ocean Beach, in the Bay of Plenty, from a clean, coarse, sandy bottom in March by Mr A. W. B. Powell. A critical examination of the three discloses no difference whatever, even the measurements are identical.
Localities.—Smugglers' Bay, Whangarei Heads, 2/11/31 (type), Parengarenga Harbour, North Auckland, February, 1932, and Mount Maunganui, Tauranga.
The type was brought to me by Miss Lucy Cranwell, after whom I have specifically named this fish. Holotype in the Auckland Museum.