Notes on egg structure and larval development in the highly miniaturised and progenetic Paedocypris (Teleostei: Cyprinidae)

Digital Gems > Biodiversity Library of Southeast Asia

Language

English

Creator

Conway, K. W.
Perrin, O.
Britz, R.

Source Title

The Raffles Bulletin of Zoology

Publication date

2018/06/29

Publisher

Dept. of Zoology, National University of Singapore, Singapore

Page

394–401

Content Type

Journal Article

Object Type

Text

Terms of Use

Open Access

Access Status

Open

Repository

NUS Libraries

Start File Page

394

End File Page

401

Volume

66

Issue

2

Call Number

QL319 NMB

Subject

Cyprinidae -- Eggs

Keyword

ontogeny
miniaturisation
zebrafish

Abstract

Egg structure and larval development of Paedocypris carbunculus are described based on 15 specimens (2 eggs, 13 larvae) obtained from captive rearing. The adhesive eggs, which are laid on the underside of plant leaves, are 450–500 μm in diameter with a smooth surface. Eggs hatch ca. 36 hours after egg deposition, and newly hatched larvae measure ca.1.6 mm. Larvae attach to the substrate using a gular adhesive organ, comprising a concave central depression surrounded by a low semi-circular ridge of elevated epidermal cells. The yolk sac is fully resorbed by 2.1 mm NL. The swimbladder is present by 2.0 mm NL and is divided into anterior and posterior chambers by 4.1 mm SL, which become widely separate and connected via a short duct by 5.3 mm SL. Flexion occurs by 4.0 mm SL. The sequence of fin ray formation is caudal>anal>dorsal>pectoral>pelvic. Adult fin ray counts and pigmentation are present by 7.6 mm SL.

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