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Microstelma

Gastropoda - Rissoidae

Taxonomy
Microstelma was named by Adams (1861) [Sepkoski's age data: T Mi-l R Sepkoski's reference number: 650]. It is extant.

It was assigned to Rissoininae by Ponder (1984); to Rissoidae by Todd (2001); and to Neotaenioglossa by Sepkoski (2002).

Synonyms
Synonymy list
YearName and author
1861Microstelma Adams
1867Amaurella Adams
1867Crepitacella Guppy p. 500
1873Dolophanes Gabb p. 272
1928Crepitacella Woodring p. 360
1972Crepitacella Perrilliat p. 26
1984Microstelma Ponder p. 97
2001Microstelma Todd
2002Microstelma Sepkoski

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassCaenogastropoda(Cox 1959)
—Sorbeoconcha(Ponder and Lindberg 1997)
—Hypsogastropoda(Ponder and Lindberg 1997)
superfamilyRissooideaGray 1847
familyRissoidaeGray 1847
genusMicrostelmaAdams 1861

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.

G. Microstelma Adams 1861
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Invalid names: Amaurella Adams 1867 [synonym], Crepitacella Guppy 1867 [synonym], Dolophanes Gabb 1873 [synonym]
Diagnosis
ReferenceDiagnosis
W. F. Ponder 1984Shell: of medium to large size, ovateconic, with narrow to absent umbilical chink; weak to moderate axial ribs and weak spiral striae; axial ribs (if present) do not extend over base. Base with prominent fasciole. Aperture with simple peristome, prominently channelled and angled anteriorly and posteriorly. Outer lip opisthocline, with weak varix externally; inner lip rather narrow (Figs 67; 68). Protoconch conical, multispiral or paucispiral (about 3 Yz whorls in M. melanoides, about 2 in M. cepula and M.japonica, and I Yz in M. daedala), micro sculpture absent (known only in M. japonica, Fig. 1420).
Measurements
No measurements are available
Composition: aragonitec
Locomotion: actively mobilef
Life habit: epifaunalf
Diet: grazerf
Vision: limitedc
Created: 2009-09-10 07:55:20
Modified: 2009-09-10 09:55:20
Source: f = family, c = class
References: Hendy et al. 2009, Kiessling 2004

Age range: base of the Langhian to the top of the Piacenzian or 15.97000 to 2.58800 Ma

Collections (20 total)


Time interval Ma Country or state Original ID and collection number
Langhian15.97 - 13.82Dominican Republic Crepitacella cepula (74959)
Messinian7.246 - 5.333Dominican Republic Crepitacella cepula (75041)
Messinian - Zanclean7.246 - 3.6Dominican Republic Crepitacella cepula (74969 75037 75038)
Early/Lower Pliocene5.333 - 3.6Dominican Republic Crepitacella cepula (58815 58819)
Zanclean5.333 - 3.6Dominican Republic Crepitacella sp. (74965 80084)
Pliocene5.333 - 2.588Costa Rica Crepitacella limonensis (134667)
Late/Upper Pliocene3.6 - 2.588Mexico Crepitacella cepula (77713 77714)
Late/Upper Pliocene3.6 - 2.588Jamaica Crepitacella cepula (69093) Crepitacella cepula, Crepitacella aresca (58522) M. cepula (69092) M. cepula, Crepitacella cepula (69089) M. cepula, M. aresca (69090) M. cepula, M. aresca, Crepitacella cepula (69094)
Piacenzian3.6 - 2.588Panama (Bocas del Toro) M. sp. (61344)
Piacenzian3.6 - 2.588Panama (Bocas) M. sp. (61343)