LARVAE & TRILOBITE ORDERS: LICHIDA

from Chatterton, 1980, Chatterton et al., 1997, and unpublished.

CLASSIFICATION & LARVAE:

Protaspides of the two main families (i.e. Lichidae & Odontopleuridae) are rather well-known. Both larval morphotypes are really characteristic and so, the attribution to one or the other of these groups is easy.         According to Chatterton & Speyer (1997), possible protaspides of dameselloids are known from the Cambrian of China (Endo, 1939a,b) but they have been poorly figured and consequently, should be restudied before they can be used in systematics.

Table 1. Classification scheme of the order Lichida (from Fortey, new Treatise, 1997 with minor changes). Protaspid larvae of 2 (yellow & bold) perhaps 3 of the 5 families have been described so far.

PICTURES:

LICHOIDEA:

Amphilichas aff. A. aspratilis

Hemiarges turneri

from Chatterton, 1980

from Chatterton, 1980

ODONTOPLEUROIDEA:

Undetermined odontopleurid (?ceratocephalid) species

from Chatterton et al., 1997

LOCALITIES:

1. Esbataottine Formation, Mackenzie Mountains, Canada. MIDDLE ORDOVICIAN 2. Crown Point Formation, New York State, USA. MIDDLE ORDOVICIAN 3. Edinburg & Martinsburg Formations, Virginia, USA. MIDDLE ORDOVICIAN 4. Taemas Formation, New South Wales, Australia. EARLY DEVONIAN 5. Las Aguaditas Formation, San Juan Province, Argentina. LATE ORDOVICIAN 6. Kushan Formation, Shandong Province, China. MIDDLE CAMBRIAN

ARTICLES:

NOTE: This list only concerns articles where protaspid larvae of lichid trilobites have been described or figured.

CHATTERTON, B.D.E. 1971. Taxonomy and ontogeny of Siluro-Devonian trilobites from near Yass, New South Wales. Palaeontographica (A), 137: 1-108. CHATTERTON, B.D.E. 1980. Ontogenetic studies of Middle Ordovician trilobites from the Esbataottine Formation, Mackenzie Mountains, Canada. Palaeontographica (A), 171: 1-74. CHATTERTON, B.D.E., G.D., EDGECOMBE, N.E., VACCARI, & B.G. WAISFELD. 1997. Ontogeny and relationships of the Ordovician odontopleurid trilobite Ceratocara, with new species from Argentina and New York. Journal of Paleontology, 71(1): 108-125. ENDO, R. 1939a. Description of Blackwelderia quadrata n.sp. and its post-embryonic development. Bulletin of the Central National Museum of Manchoukuo, 1: 1-6. ENDO, R. 1939b. The post-embryonic development of Blackwelderia quadrata Endo. Proceedings of the Imperial Academy, Tokyo, 15: 131-134. HU, C.-H. 1974. Ontogenies of two Middle Ordovician from Edinburg Formation of Virginia. Trans.Proc.Palaeont.Soc.Japan, 95: 353-363. HU, C.-H. 1974. Ontogenies of a few Middle Ordovician trilobites from the Edinburg Formation of Virginia, USA. Bulletin of the Geological Survey of Taiwan, 24: 51-67. KOBAYASHI, T. 1955. Notes on Cambrian fossils from Yentzuyai, Tawenkou, in Shantung. Trans. Proc. Palaeont. Soc. Japan, N.S., 20: 89-98.    PARK, T.-Y., S.J., MOON, Z., HAN & D.K. CHOI. 2008. Ontogeny of the Middle Cambrian trilobite Shantungia spinifera Walcott, 1905 from North China and its taxonomic significance. Journal of Paleontology, 82(4): 851-855.    NEW SPEYER, S.E. & B.D.E. CHATTERTON. 1989. Trilobite larvae and larval ecology. Historical Biology, 3: 27-60. TRIPP, R.P. & W.R. EVITT. 1981. Silicified Lichidae (Trilobita) from the Middle Ordovician of Virginia. Geological Magazine, 118(6): 665-677. WHITTINGTON, H.B. 1956a. Silicified Middle Ordovician trilobites: the Odontopleuridae. Bulletin of the Museum of Comparative Zoology, 114(5): 155-288. WHITTINGTON, H.B. 1956b. Beecher's lichid protaspis and Acanthopyge consanguinea (Trilobita). Journal of Paleontology, 30: 1200-1204.

For more general information about the Order Lichida, visit Sam Gon's Lichida Summary page

AGNOSTIDA

HARPETIDA

PTYCHOPARIIDA

REDLICHIIDA

ASAPHIDA

PHACOPIDA

CORYNEXOCHIDA

PROETIDA

(HARPETIDA)

(PHACOPIDA)

Last modified: Jan. 25th 2008

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