Hypselodoris katherinae

Distribution. Indonesia, Eastern Malaysia, and the Philippines (Gosliner et al. 2008). Here representing a first record for Thai waters.

Sumber: An updated inventory of sea slugs from Koh Tao, Thailand, with notes on their ecology and a dramatic biodiversity increase for Thai waters

Description External morphology: Living animals (Fig. 1 G – I) moderately large, 20 – 32 mm in length. Body long, slender, translucent pink to peach. Fine parallel or intersecting red longitudinal lines or interrupted dashes on notum sides of body and foot. Large, scattered opaque white tubercles on notum of larger individuals. Scattered bluepurple spots found around margin of notum and foot, forming continuous line in some specimens. Pigment more dense in centre of spot. Seven to nine unipinnate gill branches having a translucent white base and inner margin and bright red – orange pigment on inner and outer surfaces of rachis and some gill filaments. Bulb of perfoliate rhinophores mostly red – orange, with some translucent white on anterior face. Bulb with eight to 16 congested lamellae. Base of rhinophores red anteriorly, with opaque white on posterior face. Mantle glands: Subcutaneous mantle glands simple and rounded in shape (Fig. 2 H). Glands situated around entire margin of anterior and posterior ends in two specimens examined (CASIZ 177532, CASIZ 176771). Few scattered lateral glands also present. Anterior and posterior glands larger than lateral ones. Buccal armature: Muscular portion of buccal mass about equal in length to oral tube. Chitinous labial cuticle found at anterior end of muscular portion of the buccal mass bearing numerous jaw rodlets (Fig. 17 A). Rodlets narrow and acutely pointed anteriorly, with single apex (Fig. 17 B). Radular formula of holotype (CASIZ 176771) 55 × 53.0.53, and 61 × 67.0. 67 in one paratype (CASIZ 181251; Fig. 17 C). Rachidian row of teeth absent (Fig. 17 D). Innermost lateral teeth having one to three triangular denticles on inner side of bifid primary cusp, with another one or two denticles on the outside. Next several laterals lacking inner triangular denticles but possessing one to three denticles on outer side of primary bifid cusps. Midlateral teeth (Fig. 17 E) all lacking inner denticles but having three to five sharply pointed, triangular outer denticles. Outermost teeth having a narrower base and somewhat shorter tooth shape, with four to seven rounded to pointed outer denticles (Fig. 17 F). Reproductive system: Reproductive organs fully mature in one specimen examined (CASIZ 176771; Fig. 13 C). Ampulla thick, tubular, narrowing somewhat before bifurcating into oviduct and vas deferens. Short oviduct entering female gland mass near albumen gland. Prostatic proximal portion of vas deferens convoluted, curved and thick, covering bursa copulatrix. Vas deferens narrowing slightly as it transitions into long, convoluted, muscular ejaculatory portion. Ejaculatory portion widening into enlarged penial bulb. Penial papilla distinctly curved with broad base, devoid of penial hooks. Penial bulb adjacent to thick, slightly narrower vaginal duct at common gonopore. Female gland mass consisting of large mucous gland and small membrane and albumen glands. Large, lobate vestibular gland situated near exit of mucous gland. Vagina thick, curved, leading to minute receptaculum seminis and larger spherical, thin-walled receptaculum seminis. Receptaculum situated near base of bursa. Moderately short, narrow uterine duct emerging from vagina distal to base of bursa and female gland mass, near albumen gland.

Sumber: Reading between the lines: revealing cryptic species diversity and colour patterns in Hypselodoris nudibranchs (Mollusca: Heterobranchia: Chromodorididae)

Geographical distribution Known from the Philippines, eastern Malaysia and Indonesia (Gosliner et al., 2008).

Sumber: Reading between the lines: revealing cryptic species diversity and colour patterns in Hypselodoris nudibranchs (Mollusca: Heterobranchia: Chromodorididae)