Pisidium casertanum

Pisidium casertanum, the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae.

Pisidium casertanum
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
Order: Sphaeriida
Superfamily: Sphaerioidea
Family: Sphaeriidae
Genus: Pisidium
Species:
P. casertanum
Binomial name
Pisidium casertanum
(Poli, 1791)
Synonyms

Cardium casertanum Poli, 1791
Pisidium novaezelandiae Prime, 1862
Corneocyclas aucklandica Suter, 1907

Description

The shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations. The umbos are slightly behind the middle. The Periostracum is silky, scarcely glossy. In colour it is whitish to grey-brown and often the shell is coated with reddish-brown deposits.

The shell is of similar shape to Sphaerium novaezelandiae but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally.

Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm.

Pisidium casertanum Presence in European countries

Distribution

It has a cosmopolitan distribution and is perhaps the world's widely distributed non-marine mollusc.

gollark: processor : 0vendor_id : AuthenticAMDcpu family : 23model : 1model name : AMD Ryzen 3 1200 Quad-Core Processorstepping : 1microcode : 0x800111ccpu MHz : 3410.279cache size : 512 KBphysical id : 0siblings : 4core id : 0cpu cores : 4apicid : 0initial apicid : 0fpu : yesfpu_exception : yescpuid level : 13wp : yesflags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smcabugs : sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypassbogomips : 6989.20TLB size : 2560 4K pagesclflush size : 64cache_alignment : 64address sizes : 43 bits physical, 48 bits virtualpower management: ts ttp tm hwpstate eff_freq_ro [13] [14]
gollark: I mean, you might accidentally hack into the pentagon, and then if you hit the virtual firewall they'll backtrace your IP with visual basic.
gollark: Yes, well.
gollark: `/usr/bin/hack --master /dev/fbi`
gollark: I'm someone who hangs around doing stuff & things.

References
  1. Janus, Horst, 1965. ‘’The young specialist looks at land and freshwater molluscs’’, Burke, London
  2. Anderson, Roy (2005). "An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637" (PDF).
  3. (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
  4. Juřičková L., Horsák M. & Beran L., 2001: Check-list of the molluscs (Mollusca) of the Czech Republic. Acta Soc. Zool. Bohem., 65: 25-40.
  5. Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
  6. "Anemoon > Flora en Fauna > Soorteninformatie". www.anemoon.org.
  7. Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
  8. Kuiper, J. G. J.; Økland, K. A.; Knudsen, J.; Koli, L.; von Proschwitz, T.; Valovirta, I. (1989), "Geographical distribution of the small mussels (Sphaeriidae) in North Europe (Denmark, Faroes, Finland, Iceland, Norway and Sweden)" (PDF), Annales Zoologici Fennici, 26 (2): 73–101
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.